OPA GX8138 - An Ideal Replacement for the AD8138

As a classic full differential amplifier, AD8138 has been widely used in industrial control and electronic circuit design. However, with the continuous development of Chinese chip technology, the GX8138 full differential amplifier‘s excellent differential signal processing has gradually become a powerful alternative to the AD8138. In this article, the parameters and application advantages of GX8138 to replace AD8138 will be analyzed in detail to help engineers quickly select the type.

GX8138 and AD8138 performance parameters comparison:

1, signal processing: AD8138 can be used as a single-ended to differential amplifiers or differential to differential amplifiers, it is easy to use like operational amplifiers. The GX8138 can also be used as a single-ended to differential amplifiers can also be differential to differential amplifiers, like a general operational amplifiers as easy to use, greatly simplifying the differential signal amplification and drive.

2, AD8138 and GX8138 have good distortion performance, becoming the ideal ADC driver for communication systems, enough to drive the latest 10-bit to 16-bit converters under higher frequency conditions. The high bandwidth and IP3 characteristics make it suitable for use as a gain module in IF and baseband signal chains. Outstanding detuning and dynamic performance makes the device particularly suitable for a variety of signal processing and data acquisition applications.

Both the AD8138 and GX8138 have adjustable output common-mode voltages and support externally adjustable gain. The devices eliminate the need for transformers with high-performance ADCs and retain low-frequency and DC information. The common mode level of the differential outputs can be adjusted by applying a voltage to the VOCM pin, making it easy to level shift the input signal driving the single-supply ADC. Fast overload recovery ensures sampling accuracy. 

The AD8138 is available in SOIC and MSOP packages, and the GX8138 also supports SOIC and MSOP packages, and can be replaced by PIN to PIN.

In wireless and wired communication systems, AD8138 is often used in the front-end processing of signals, GX8138 with its good bandwidth, noise performance and high gain characteristics, can also be capable of such work, can be effective amplification and conditioning of communication signals to ensure the stability and accuracy of signals in the transmission process, whether it is in the signal processing of the base station, optical communications in the IF signal amplification or other communication areas in the signal processing link. Whether in the signal processing of base station, IF signal amplification in optical communication or signal processing in other communication fields, GX8138 can be used as an alternative to AD8138.